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Utility of combined hip abduction angle for hip surveillance in children with cerebral palsy

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Abstract

Background: Spontaneous hip lateralization complicates the management of non-ambulatory children with cerebral palsy (CP). It can be diagnosed early using radiographs, but it involves standardization of positioning and exposure to radiation. Hence, the aim of this study was to assess the utility of Combined hip abduction angle (CHAA) in the clinical setting to identify those children with CP who were at greater risk to develop spontaneous progressive hip lateralization.

Materials and Methods: One hundred and three children (206 hips) with CP formed our study population. There were 48 boys and 55 girls aged 2–11 years (mean 5.03 years). 61 children were Gross Motor Function Classifcation System (GMFCS) level 5, while 42 were GMFCS level 4. Clinical measurements of CHAA were statistically correlated with radiographic measurements of Reimer’s migration percentage (MP) for bivariate associations using χ2 and t tests.

Results: CHAA is evaluated against MP which is considered as a reliable measure of hip subluxation. Thus, for CHAA, sensitivity was 74.07% and specifcity was 67.35%. False-positive rate was 32.65% and false-negative rate was 25.93%.

Conclusions: Our study shows that correlation exists between CHAA and MP, which has been proved to be useful for hip screening in CP children at risk of hip dislocation. CHAA is an easy, rapid, cost-effective clinical test which can be performed by paraclinical health practitioners (physiotherapists) and orthopedic surgeons.

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Authors and Affiliations

  1. Bombay Hospital Institute of Medical Sciences, Oshiwara, Mumbai, India

    Atul Bhaskar (Honorary Paediatric Orthopaedic Surgeon, Paediatric Orthopaedic Surgeon)

  2. Children Orthopaedic Clinic, Oshiwara, Mumbai, India

    Atul Bhaskar (Honorary Paediatric Orthopaedic Surgeon, Paediatric Orthopaedic Surgeon)

  3. Orthopaedic Department, K.J.Somaiya Medical College, Hospital & Research Centre, Oshiwara, Mumbai, India

    Akshay Divecha

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  1. Akshay Divecha
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  2. Atul Bhaskar
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Correspondence to Akshay Divecha.

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Divecha, A., Bhaskar, A. Utility of combined hip abduction angle for hip surveillance in children with cerebral palsy. IJOO 45, 548–552 (2011). https://doi.org/10.4103/0019-5413.87129

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